Discussion
What is the half power beamwidth of an antenna?
Answer: A
Half power beamwidth is the angular width of the main lobe measured where the power has fallen to half its peak, that is by three decibels. The angle between first nulls is the first null beamwidth, roughly twice as wide for a uniform aperture. Side lobe level is a separate specification, and radiation is detectable over essentially all angles, so the last option describes nothing measurable. Beamwidth and directivity are inversely related, which is the quantitative content of the idea of a beam.
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